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Restructuring and Asset Related Charges DowDuPont Cost Synergy Program (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 22 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Asset Related Charges - Net | $ 60 | $ 101 | $ 121 | $ 231 |
DowDuPont Cost Synergy Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Beginning Balance |  |  | 215 |  |
Restructuring and Asset Related Charges - Net | 60 | 101 | 122 | 231 | $ 874
Payments for Restructuring |  |  | (140) |  |
Asset write-offs and adjustments |  |  | (38) |  |
Restructuring Reserve, Ending Balance | 159 |  | 159 |  | 159
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Beginning Balance |  |  | 154 |  |
Restructuring and Asset Related Charges - Net | 0 | 64 | 14 | 137 | 340
Payments for Restructuring |  |  | (60) |  |
Asset write-offs and adjustments |  |  | 0 |  |
Restructuring Reserve, Ending Balance | 108 |  | 108 |  | 108
Contract Termination Charges | DowDuPont Cost Synergy Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Beginning Balance |  |  | 61 |  |
Restructuring and Asset Related Charges - Net | 49 | 23 | 69 | 37 | 193
Payments for Restructuring |  |  | (79) |  |
Asset write-offs and adjustments |  |  | 0 |  |
Restructuring Reserve, Ending Balance | 51 |  | 51 |  | 51
Asset Related Charges [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Beginning Balance |  |  | 0 |  |
Restructuring and Asset Related Charges - Net | 11 | 14 | 39 | 57 | 341
Payments for Restructuring |  |  | (1) |  |
Asset write-offs and adjustments |  |  | (38) |  |
Restructuring Reserve, Ending Balance | 0 |  | 0 |  | $ 0
Seed [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Asset Related Charges - Net | (49) | (37) | (76) | (83) |
Seed [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Asset Related Charges - Net | 49 | 37 | 73 | 83 |
Crop Protection [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Asset Related Charges - Net | (2) |  | (25) | (12) |
Crop Protection [Member] | DowDuPont Cost Synergy Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Asset Related Charges - Net | 2 | 0 | 29 | 12 |
Corporate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Asset Related Charges - Net | (9) | (64) | (20) | (136) |
Corporate | DowDuPont Cost Synergy Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Asset Related Charges - Net | $ 9 | $ 64 | $ 20 | $ 136 |

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